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/usr/include/wireshark/wsutil/unicode-utils.h is in libwsutil-dev 2.4.5-1.

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/* unicode-utils.h
 * Unicode utility definitions
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 2006 Gerald Combs
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#ifndef __UNICODEUTIL_H__
#define __UNICODEUTIL_H__

#include <config.h>

#include "ws_symbol_export.h"

#include <glib.h>

/**
 * @file
 * Unicode convenience routines.
 */

#ifdef	__cplusplus
extern "C" {
#endif

WS_DLL_PUBLIC
int ws_utf8_char_len(guint8 ch);

#ifdef _WIN32

#include <windows.h>
#include <tchar.h>
#include <wchar.h>

/** Given a UTF-8 string, convert it to UTF-16.  This is meant to be used
 * to convert between GTK+ 2.x (UTF-8) to Windows (UTF-16).
 *
 * @param utf8str The string to convert.  May be NULL.
 * @return The string converted to UTF-16.  If utf8str is NULL, returns
 * NULL.  The return value should NOT be freed by the caller.
 */
WS_DLL_PUBLIC
const wchar_t * utf_8to16(const char *utf8str);

/** Create a UTF-16 string (in place) according to the format string.
 *
 * @param utf16buf The buffer to return the UTF-16 string in.
 * @param utf16buf_len The size of the 'utf16buf' parameter
 * @param fmt A standard g_printf() format string
 */
WS_DLL_PUBLIC
void utf_8to16_snprintf(TCHAR *utf16buf, gint utf16buf_len, const gchar* fmt,
	...) G_GNUC_PRINTF(3, 4);

/** Given a UTF-16 string, convert it to UTF-8.  This is meant to be used
 * to convert between GTK+ 2.x (UTF-8) to Windows (UTF-16).
 *
 * @param utf16str The string to convert.  May be NULL.
 * @return The string converted to UTF-8.  If utf16str is NULL, returns
 * NULL.  The return value should NOT be freed by the caller.
 */
WS_DLL_PUBLIC
gchar * utf_16to8(const wchar_t *utf16str);

/** Convert the program argument list from UTF-16 to UTF-8 and
 * store it in the supplied array. This is intended to be used
 * to normalize command line arguments at program startup.
 *
 * @param argc The number of arguments. You should simply pass the
 * first argument from main().
 * @param argv The argument values (vector). You should simply pass
 * the second argument from main().
 */
WS_DLL_PUBLIC
void arg_list_utf_16to8(int argc, char *argv[]);


#endif /* _WIN32 */

/*
 * defines for helping with UTF-16 surrogate pairs
 */

#define IS_LEAD_SURROGATE(uchar2) \
	((uchar2) >= 0xd800 && (uchar2) < 0xdc00)
#define IS_TRAIL_SURROGATE(uchar2) \
	((uchar2) >= 0xdc00 && (uchar2) < 0xe000)
#define SURROGATE_VALUE(lead, trail) \
	(((((lead) - 0xd800) << 10) | ((trail) - 0xdc00)) + 0x10000)

#ifdef	__cplusplus
}
#endif

#endif /* __UNICODEUTIL_H__ */